is it a mature hairline or a receding hairline? my dad had a receding hairline at 38,uncles aren't bald at all (photos)

Many men's hairlines mature from 17-25 years of age.  Without seeing up close it's more difficult to tell if there is genetic hair loss or hair follicle miniaturization in any particular area.  Your hairline has been fairly stable over the past 2 years. It's unlikely there is much of anything significantly going on right now. 

Everyone one loses 100-150 hairs per day so don't worry about that. Maturing hairlines occur between 17-29 years old and are not balding. If your hairline is maturing, lift your eyebrows up to make your forehead wrinkle and if you have a maturing hairline, it will be about 1 finger breath above the highest crease in your furrowed brow.